Answer:
<em>The probability that the button is not white is </em><em>0.583</em>
Step-by-step explanation:
The jar contains 30 red, 40 blue, and 50 white buttons.
In total there are 120 buttons in the jar. So,

Let us assume that, A be the event of picking white buttons, so

So the probability of picking white button is,

Then the event
will be not picking up white buttons, so the probability of not picking up white buttons is,

if c is -1 the equation should be
4x² + 4x -1 = 0
not plus 1
I assume you want the coordinates of the zeros.
if c is indeed -1, they are at (-1.207 , 0) and (0.207 , 0)
if c is +1, as in the equation the only zero point is at (-0.5 , 0)
see screenshot for illustration
On what question did u go wrong
.875 .88 .98
7/8, 9/9, .98 is your answer from least to greatest!